http://www.mulsannescorner.com/newssept08.html has a good summary of the rule changes for 2009. Apparently the rear wing reduction caught people by surprise:
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According to Nick Wirth, Chief of Design for the Acura LMP1 effort, "The ACO told us and all manufacturers some months ago that they were considering a rear wing change and engine restrictor changes - nothing else. So we didn't put a huge effort into a new rear, but I was surprised by the width reduction." Presumably this means back to the wind tunnel in order to optimize the rear wing due to the late implementation of the new rear wing regs and the ACO's lack of communication with the outfits embroiled in 2009 developments.
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Another interesting fact:
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Cars running air conditioning get a .3 mm inlet restrictor increase. No explanation has been given for this.
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